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COMMITMENTS AND CONTINGENCIES - Business Insurance Recoveries (Details) - Cybersecurity Incident - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 7 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Accrued Liabilities |  |  |  |
Beginning Balance | $ 0.0 | $ (75.6) | $ (87.5) |
(Expenses incurred) insurance receivable recorded | (87.5) | (4.1) | (76.5) |
Payments made (received) | 0.0 | 52.2 | 88.4 |
Ending Balance | (87.5) | (27.5) | (75.6) | $ (27.5)
Insurance Receivable |  |  |  |
Beginning Balance | 0.0 | 35.0 | 0.0 |
(Expenses incurred) insurance receivable recorded | 0.0 | 10.0 | 50.0 |
Payments made (received) | 0.0 | (35.0) | (15.0) | (50.0)
Ending Balance | $ 0.0 | $ 10.0 | $ 35.0 | $ 10.0

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